CVE-2026-19856
Deferred Deferred - Pending Action

BaseFortify

Publication date: 2026-10-02

Last updated on: 2026-10-06

Assigner: WPScan

Description
The All in One SEO WordPress plugin before 5.0.2.1 does not correctly determine which shortcodes are present in content derived from user input before deciding which ones to strip, allowing unauthenticated users to execute arbitrary shortcodes registered on the site. On sites upgraded from older versions the protection is disabled outright, making the issue reachable without any crafted input.

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Meta Information

Published
2026-10-02
Last Modified
2026-10-06
Generated
2026-10-19
AI Q&A
2026-10-02
EPSS Evaluated
2026-10-18
NVD
CVE-2026-19856
EUVD
EUVD-2026-91769

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
Unknown All in One SEO 0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-74 The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

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Executive Summary

This vulnerability affects the All in One SEO WordPress plugin before version 5.0.2.1. It allows unauthenticated users to execute arbitrary shortcodes by exploiting improper handling of user input in search queries. The plugin fails to correctly identify and strip shortcodes from user-provided content before processing it.

Detection Guidance

Check the installed version of the All in One SEO plugin in WordPress. If it is below 5.0.2.1, the system is vulnerable. Use commands like 'wp plugin list' in WP-CLI or inspect the plugin files for version information in the WordPress admin panel.

Impact Analysis

An attacker could exploit this to execute malicious shortcodes on your WordPress site, potentially leading to unauthorized actions, data leaks, or further compromise of your site. Sites upgraded from older versions are at higher risk as the protection is disabled by default.

Compliance Impact

This vulnerability could lead to unauthorized code execution, potentially violating data protection requirements under GDPR or HIPAA if sensitive data is exposed or modified. Compliance may be impacted if the vulnerability results in data breaches or unauthorized access.

Mitigation Strategies

Update the All in One SEO plugin to version 5.0.2.1 or later immediately. If upgrading is not possible, disable the plugin temporarily until the update is applied. Review and remove any suspicious shortcodes in content that may have been injected.

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